Oil -- typically olive oil -- symbolizes the good that comes from celestial love. Celestial love is love of the Lord, the highest and purest love we can have. The good of celestial love is the desire to be good springing from celestial love: Wanting to do the Lord's will because you love Him. That's not a state many reach, even in heaven, but it's a beautiful goal. This representation makes sense based on the idea that the sun -- the source of all natural light and heat, and thus all natural life -- represents the Lord, the source of all spiritual light, heat and life. Burning oil was the most pure fire available in Biblical times, thus the closest representation of the sun people could create.

10375. 'And He gave to Moses, when He had finished talking to him from Mount Sinai, the two tablets of the Testimony' means a joining of the Lord to a person by means of the Word. This is clear from the representation of 'Moses' as the Word, dealt with in the places referred to in 9372; from the meaning of 'when He had finished talking to him' as after all things had been instituted, for what Jehovah talked about to Moses on Mount Sinai was the things to be instituted among the children of Israel, thus things of the Church; from the meaning of 'Mount Sinai' as heaven, where Divine Truth comes from, dealt with in 8805, 9420; from the meaning of 'the two tablets' as the law in its entirety, thus the Word, dealt with in 9416; and from the meaning of 'the Testimony' as the Lord in respect of Divine Truth, dealt with in 8535, 9503. The joining to a person by means of the Word is meant by the fact that the tablets were two in number and were joined together as if by a covenant, see 9416. 'Two' furthermore means a joining together, 5194, 8423. From all this it is evident that 'Jehovah gave to Moses, when He had finished talking to him from Mount Sinai, the two tablets of the Testimony' means that after the Church has been established a joining of the Lord to a person is accomplished by means of the Word sent down from Him out of heaven.

The Word is the means by which the Lord flows in with a person, talks to him, and is joined to him, see 1775, 2310, 2899, 3476, 3735, 3982(end), 4217, 9212(end), 9216(end), 9357, 9380, 9396, 9400, 9401, 10290.